Vacuum pet litter remover

ABSTRACT

A vacuum pump for pet litter comprises a housing and a litter container at one end of the housing. A piston is located in the housing which reciprocates between a first position and a second position wherein movement of the piston from the first position to the second position produces a vacuum in the litter container. The pump includes a spring for urging the piston towards the second position, a handle for moving the piston to the first position and a holding member which holds the piston at the first position. Operation of a release trigger permits the piston to move from the first to the second position.

CROSS REFERENCE TO RELATED APPLICATIONS

[0001] This application is a continuation in-part application of U.S.application Ser. No. 10/068,155 filed Feb. 5, 2002, and incorporatedherein by reference in its entirety.

BACKGROUND OF INVENTION

[0002] Vacuum Pump for Pet Litter Removing is a device for removinganimal's feces from grass surfaces, pavements and other public areas.The present invention is constructed in such a way that it is capable ofremoving the waste regardless of its consistency. Often, especially whenhaving digestion difficulties, pets' feces are thin in consistency andare difficult to remove with the existing methods and devices.

[0003] The existing devices for removing pets' waste address the problemonly partially. The most popular way is to dispose manually with thehelp of a plastic bag wrapped around the owner's hand. Another methodspecified in U.S. Pat. No. 6,123,046 is to position the device under thedefecating animal which obviously uncomfortable for both the pet and theowner.

[0004] The device described in U.S. Pat. No 4,078,838, consists of atelescopic tube containing a plunger. In the upper end of the plunger aspiral spring is positioned. In the lower end of the plunger there is aslot where a plastic bag specially produced to fit the plunger isplaced. When the plunger moves upwards, the plastic bag is drawn in thetelescoping tube and is supposed to take the feces it is placed uponwith it. This design makes the device difficult to use because thefriction between the bag and the feces is not sufficient, especially ifthe latter is with slight consistency.

BRIEF SUMMARY OF THE INVENTION

[0005] The presented invention is a vacuum pump with which pet littercan be removed, regardless of its consistency. It is composed of a wastecollecting container, main cylinder with a piston, a spring positionedalong the piston's axis, a mechanism for winding the spring and triggerused for releasing the spring. The process is performed without the needfor the pet's owner to bend over and touch the feces. The use of vacuumallows the device to be efficient regardless of the consistency of theanimal litter and the surface area: grass, bushes, or road surface.

BRIEF DESCRIPTION OF THE DRAWINGS

[0006]FIG. 1 shows a section of the device along its length, ready foruse;

[0007]FIG. 2 shows the details of the device used to wind the spring, aswell as the trigger;

[0008]FIG. 3 shows the device after using;

[0009]FIGS. 4A, 4B and 4C show different embodiments of a wastecollector container;

[0010]FIG. 5 shows a section of the second proposed design along itslength, after using the device;

[0011]FIG. 6 shows the device from FIG. 5 ready for use;

[0012]FIG. 7 shows the devise from FIG. 5 ready for transport;

[0013]FIG. 8 shows the shape of washer 16A and tube 22A; and

[0014]FIG. 9 shows the shape of flange 26.

DETAILED DESCRIPTION OF THE INVENTION

[0015] As one can see from the attached drawings, the invention consistsof:

[0016] A waste collector container composed of a lid 1, plastic bag 2and vacuum tube 3. The plastic bag is placed within the cylinder 5 andis fixed there using the lid 1. Within the cylinder 5 is positioned apiston consisting of gasket 6 and a tube 14. In the hollow of the tube14 is placed a spring 23, its lower end attached to the gasket 6, andits upper end attached to a lid 13. Along the wall of the tube 22 thereis a long slit through witch the connecting rib 9A of component 9 passesallowing it to be fixed to the cylindrical handle 21. Over component 9is placed the loading washer 20.

[0017] The connecting cylinder 17 has a slit along its length, parallelto the slit in the tube 22. It is used to connect tube 22 and the tube19. In the upper part of component 17 a spring 10 is placed. Abovecomponent 17 is placed the stopping washer 16. Within the wall of tube19 is incorporated rib 15 and diametrically opposite to it is thetriggering mechanism 11, comprising a body, axis and trigger 12.

[0018] In the upper end of tube 14 there is a ring 14B, used to restrictits movement downwards when the device is being wound.

[0019] The winding of the spring is accomplished by moving thecylindrical handle 21 which forces the rib 9A to press one of the endsof the loading washer, thus taking it out of parallel. This way thewasher is stuck in the tube 14 and starts moving it, while the spring inits lower end begins to stretch. When the handle is returned in itsinitial position, stopping washer 16 raised by the spring 10 and pressedby the rib 15 in its opposite end stops the tube 14 and does not allowthe spring 23 to return the piston in its initial position. This processis repeated several times, depending on the size of the device until thespring has been wound fully when the protecting ring 14B reaches washer16 and stops the devices components from disintegrating.

[0020] When the assembled device is positioned with the hose upon thefeces and the trigger is pressed, the axis 11A presses the washer 16upon the face of the connecting component and makes its opening parallelto the tube 14, thus releasing it. The spring contracts and pulls thepiston and the gasket, creates the necessary vacuum which sucks thematerial placed beneath the hose 3. In the last phase of the piston'smovement, cushion mechanism is put into action. The air closed betweenthe piston 7, the filling washer 8 and the lower end of the tube 22, isoozed in the looseness between the components of the cushion mechanism,thus reducing the inertia force of the stopping main piston.

[0021] In the variant of the container described above, the lid 1, thevacuum tube 3 and the plastic bag 2 are discarded after use. FIG. 4shows another variant of the container where the plastic bag 2 is gluedto the vacuum tube 3 and a flange 3A is attached to it. After use, onlythe parts that have been in contact with the feces—the bag and the tubeare discarded, the lid stays permanently in its place.

[0022]FIGS. 4A, 4B and 4C show different embodiments of a wastecollector container. Each of these figures illustrates a variant withrespect to the configuration of the lid 1 and tube 3 of the wastecollector, as well as the manner in which the plastic bag 2 may beattached to the lid 1 and tube 3 in a number of different ways. Theseare intended to be example illustrations only and any suitable mannerfor attachment is possible within the scope of the invention.

[0023] Another possible design configuration for the invention is shownin FIGS. 5, 6, 7, 8 and 9. As one can see from the drawings, theinvention consists of:

[0024] A waste collector container composed of a lid 1A, plastic bag 2Aand vacuum tube 3A. The plastic bag is placed within the cylinder 5A andis fixed there using the lid 1A. Within the cylinder 5A is positioned apiston consisting of gasket 6A and a tube 14A. In the hollow of the tube14A is placed a spring 23A, its lower end attached to the gasket 6A, andits upper end attached to a cap 13A, attached to the upper of the tube22A.

[0025] In the upper end of the cylinder 5A are located two flanges 26and 28. Between them is placed washer 16A, designed as shown on FIG. 8.Through the outer openings of the flanges 26 and 28 passes the tube 22A.

[0026] Along the walls of the tube 22A there are long slots 29, throughwhich pass the extensions of washer 16A, as it can be seen on FIG. 8. Tothe lower end of the tube 22A is attached inflexibly a cylinder 25. Thehandle 27 is attached to the cylinder 5A. On the drawing shown on FIG.7, the tube 22A and the piston 6A-14A are placed in lower terminatingposition. Thus, the measurements of the device are minimized and it issuitable for transportation. This way the slots 29 in the wall of thetube 22A are pressuring the washer 16A forcing the spring 10A, thusallowing the trigger 12A to prop up the washer 16A from the one side.This way the tube 14A is fixed in its lower terminating position. Whenthe tube 22A is pulled to its upper terminating position, the cylinder25 opens up the grasping edges in the lower end of the flange 26; thetube 22A is fixed, the spring 23A remains taut and device is ready foruse (FIG. 6). The pressing of the trigger 12A allows the washer 16A tolay over the flange 28 and this way its opening become parallel to thetube 14A thus releasing it. The piston 6A-14A moves up and creates avacuum, which sucks in the litter. The air contained above the piston6A-14A is released through the openings 24 in the upper part of thecylinder 5A. Just before the upper terminating position is reached, thegasket 6A closes this openings and the air pillow that is formed slowsdown the piston 6A-14A when it is stopping. When the piston 6A-14A is inits upper terminating position, the cone 31 located in the base of thegasket 6A opens up the grasping edges 32 of the flange 26 and releasesthe tube 22A (see FIG. 5). In this way the tube 22A, together with thepiston 6A, 14A can be moved to lower terminating position and the wholeprocedure can be repeated.

1. A vacuum pump for pet litter comprising: a housing; a litter container at one end of the housing; a piston in the housing which reciprocates between a first position and a second position wherein movement of the piston from the first position to the second position produces a vacuum in the litter container; means for urging the piston towards the second position; means for moving the piston to the first position and means for holding the piston at said first position; and release means to permit the piston to move from the first to the second position.
 2. A vacuum pump as claimed in claim 1 wherein the housing comprises an elongate tube one end of which is connected to the litter container, the piston being capable of reciprocating within the elongate tube and in a direction substantially coaxial with the elongate tube.
 3. A vacuum pump as claimed in claim 1 wherein the litter container comprises a chamber, and a nozzle extending from the chamber to the exterior so that, in use, it is held over the litter.
 4. A vacuum pump as claimed in claim 3 further comprising a disposable plastic bag fitted within the chamber to receive the litter, the disposable plastic bag being replaceable with a fresh disposable plastic bag after use of the vacuum pump.
 5. A vacuum pump as claimed in claim 1 wherein the piston comprises a piston rod within the housing and a gasket at one end of the piston rod extending towards the litter container.
 6. A vacuum pump as claimed in claim 1 wherein the means for urging comprises a spring which forces the piston into the second position.
 7. A vacuum pump as claimed in claim 1 wherein the means for moving the piston comprises: a cylindrical handle extending to the outside of the housing, the handle being reciprocal along an axis which substantially corresponds with that of the piston; a gripping member connected to the cylindrical handle, the gripping member releasably engaging the piston, the handle being movable between a first and second position whereby movement of the handle from the first position to the second position causes the gripping member to engage the piston to move the piston against the action of the means for urging from the second position of the piston to the first position thereof.
 8. A vacuum pump as claimed in claim 7 wherein the means for holding the piston comprises a stop washer which holds the piston in the position to which it has been moved by the cylindrical handle.
 9. A vacuum pump as claimed in claim 1 wherein the release means comprises a trigger member extending from the outside of the housing to the means for holding the piston, the trigger member inactivating the means for holding so that the piston can move by the action of the means for urging from the first position to the second position.
 10. A vacuum pump as claimed in claim 8 wherein the release means comprises a trigger member extending between the outside of the housing and the stop member, the trigger inactivating the stop member to permit the piston to move from the first to the second position.
 11. A vacuum pump as claimed in claim 1 further comprising cushioning means for cushioning the movement of the piston as it nears the second position.
 12. A vacuum pump as claimed in claim 11 wherein the cushioning means comprises a tube having one open end within the housing, and a corresponding projection on the piston, the projection being received within the tube, the piston being of similar diameter to the insider of the tube.
 13. A vacuum pump as claimed in claim 7 wherein the cylindrical handle moves the piston in increments from the second position thereof to the first position thereof. 